Fig. 4: Dynamics of energy propagation and distribution in transport lengths.
a–c Representative plots of MSD (\({\sigma (t)}^{2}-{\sigma \left({t}_{0}\right)}^{2}\)) as a function of time for PDA (a blue), PIC (b red) and PDI (c green). The transport is divided into two regimes R1 and R2. Solid lines show a fit to the two regions (Equation 3 and D\({t}^{\alpha }\)) from which a transport velocity (v) and diffusion constant (D) can be estimated. d–i fs-TAM measurements are repeated on many different sample locations. Histograms show the frequency of velocity and Log10(D) (logarithm of diffusion coefficient, D) for PDA, PIC and PDI respectively. The data is divided between R1 (dark shading) where a velocity best describes the transport and R2 (light shading) where a diffusion coefficient is most appropriate for characterising the transport. Solid line shows a normal distribution fit to the data. The mean transport parameters obtained in both phases are indicated for comparison.
